Also known as: 11eyes: Tsumi to Batsu to Aganai no Shoujo, 11eyes: Sin, Damnation and the Atonement Girl, 11 Eyes, 11eyes CrossOver (Xbox 360, PSP), 11eyes: Resona Forma (fan disc)
11eyes was originally released by Lass in 2008 as a blood-drenched, school-themed eroge subtitled Sin, Damnation and the Atonement Girl. The game later received a non-ero edition for the Xbox 360 called 11eyes CrossOver, and a fan disc titled 11eyes: Resona Forma in April 2011. A TV anime adaptation of 11eyes was also created (it aired from autumn 2009) - as expected, considering that pretty much all the other games produced by 5pb. already had an anime version: Night Wizard, Chaos;HEAd, Prism Ark and Memories Off.
Producers, official website and other details: VNDB